Applying a patch from Sohani for fixing TOOLS-1733

git-svn-id: https://svn.wso2.org/repos/wso2/trunk/tools@190432 a5903396-d722-0410-b921-86c7d4935375
added mapping executer

git-svn-id: https://svn.wso2.org/repos/wso2/trunk/tools@190433 a5903396-d722-0410-b921-86c7d4935375
change mapping engine core

git-svn-id: https://svn.wso2.org/repos/wso2/trunk/tools@190434 a5903396-d722-0410-b921-86c7d4935375